Introduction - If you have any usage issues, please Google them yourself
Mail system is the important part in the Linux network applications, a complete email system includes three parts: the underlying operating system (Linux Operation) and Mail Transport Agent (Mail Transport Agent, the MTA), the Mail Delivery Agent (the Mail Delivery Agent, MDA), Mail User Agent (Mail User Agent, MUA).
Postfix is a very good MTA known for its high efficiency and safety features. Postfix is seen by the authors on UNIX in anti-spam in the MTA (Anti - Spam or Anti - UCE) doing the best one, and even many companies on the basis of the Postfix code for secondary development and launch anti-spam gateway product. MTA's anti-spam function is actually filtering the session during MTA processing. This filter not only filters out spam to itself, but also prevents it from being used to spam spam. Postfix implements all of the major MTA filtering technologies currently available. Postfix is the MTA (mail transfer agent) software developed by Wietse Venema under IBM's GPL protocol. Postfix is faster, easier to manage, more flexible, and more secure than Sendmail.